just some ideas....forged fittings is the way to go..heavier the better,also you may want to build target tees as it will help with pulsation issues and give the lines a "cushion". i would also put in unions so the piping could be removed with out being broke down a piece at a time for repairs,etcc. ok some more obnoxious advice...if you are building a oil resaviour,make sure you have enough room for expantion,a vented cap,a suction screen, and if possable put in a partition in it so your suction is seperated from your discharge,as to let any "junk" settle out. also blow out all fittings/piping before installation. use non detergent oil, and maybe install a liquid filled pressure guage in the line. AND at the risk of sounding stupid....make sure the pump/motor rotation is the same way.and....if equiped check the motor/pump coupling, and besure of the alignment.a oil drain port would be good to have,as would be having the discharge hoses down low so it dosen't "slough" up the fluid and make the pump cavitate,AND.....good luck, be safe and make some guards to cover stuff up, jimmy